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Considering increasing number of hybrid and electric vehicles, a growing number of car-pedestrian accident become a problem because these vehicles are virtually silent at low speeds where tire noise is not significant. To cope with this problem, a real-time approaching vehicle detection technique for pedestrians using acoustic digital communication is proposed. In this technique, a vehicle transmits...
A method to measure the transverse velocity of particle flow passing across the ultrasonic beam is discussed. We run the numerical simulations of the ultrasonic wave scattered by particle(s) and received at the transducer when particle(s) flow perpendicular to the axis of the circular planer transducer which creates an ultrasonic beam. It is observed that the spectrum bandwidth of the signal agrees...
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